As you can see here and here, a poster and a trailer have been released for Insidious: The Red Door. The film is set to be released on July 7, 2023 and takes place after the events of Insidious: Chapter 2.
The poster and the trailer can be seen below.
_poster.jpg "Insidious The Red Door (2023) poster.jpg (256 KB)")
INSIDIOUS- THE RED DOOR – Official Trailer (HD)